package main

import "fmt"

func main() {
	// c1 and c2 = nil
	var c1, c2 chan int
	select {
	case n := <-c1:
		fmt.Println("c1 = ", n)
	case n := <-c2:
		fmt.Println("c2 = ", n)
	default:
		fmt.Println("no value")
	}
}
